Nebular Spectra of the Unusual Type I[CLC]a[/CLC] Supernova 1991T
| Autor: | Weihong Liu, David J. Jeffery, David R. Schultz |
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| Rok vydání: | 1997 |
| Předmět: |
Normal type
Physics Brightness Astrophysics::High Energy Astrophysical Phenomena White dwarf Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Type (model theory) Type II supernova Spectral line Supernova Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Pair-instability supernova Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 486:L35-L38 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/310832 |
| Popis: | The nebular optical spectra of the unusual Type Ia supernova 1991T are modeled by treating important atomic processes with reliable atomic data and by assuming both Chandrasekhar-mass and sub-Chandrasekhar-mass white dwarf explosion models. Similar to the case of normal Type Ia supernovae, a better agreement between the calculated and observed spectra of SN 1991T is obtained by assuming a sub-Chandrasekhar-mass model than Chandrasekhar-mass models, though the required white dwarf mass of ~1.1 M☉ is higher for SN 1991T than the ~0.9 M☉ for normal Type Ia supernovae. This demonstrates that variation in the behavior among Type Ia supernovae can be naturally realized by a range of sub-Chandrasekhar-mass models. The optical emission of SN 1991T is well accounted for by the sub-Chandrasekhar-mass model in both brightness and spectral shape from ~7 to 14 months for a distance of 14 Mpc to the supernova. |
| Databáze: | OpenAIRE |
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